Are there any known Side Effects of Hyaluronic Acid?

Side effects are generally mild and rare. However, some people may experience minor skin irritation and more rarely small, temporary rash outbreaks. As with all treatments requiring injections, there can be swelling and for the most part, the side effects of these injections are rare but can include the risk of redness, swelling, and bruising at the injection site, as well as the possibility that the substance may be seen beneath the skin in the form of tiny bumps, a problem which typically improves over time. It is always better to err on the side of caution when undergoing any medical procedure.